Underwater exercise device



FIG. 1 is a top front right side prosective view of a underwater exercise device shown in its collapsed form;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is rear elevational thereof; and,

FIG. 6 is a top plan view thereof with the bottom being a mirror image of the top plan view. 

The ornamental design for a underwater exercise device, as shown and described. 